package com.yc.d0303;

import com.yc.util.VerifyCodeUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

// 用于生成验证码图片
@WebServlet("/vcode.s")
public class VcodeServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 必须在输出验证码之前获取会话对象
        HttpSession session = req.getSession();
        // 生成验证码， 同时向页面输出验证码图片
        String vcode = VerifyCodeUtils.outputImage(resp);
        // 将验证码保存到会话中
        session.setAttribute("vcode", vcode);
    }
}
